export default function ({
  val,
  cycleDay,
  mensesDaysAfter,
  checkIsMensesStart,
}) {
  cycleDay.bleeding = val

  // if a bleeding value is deleted or excluded, we need to check if there are
  // any following bleeding days and if the next one of them is now a cycle
  // start
  if (bleedingValueDeletedOrExluded(val)) {
    cycleDay.isCycleStart = false
    if (!mensesDaysAfter.length) return
    const nextOne = mensesDaysAfter[mensesDaysAfter.length - 1]
    if (checkIsMensesStart(nextOne)) {
      nextOne.isCycleStart = true
    }
  } else {
    cycleDay.isCycleStart = checkIsMensesStart(cycleDay)
    maybeClearOldCycleStarts(cycleDay)
  }

  function bleedingValueDeletedOrExluded(val) {
    const bleedingDeleted = !val || !(typeof val?.value === 'number')
    const bleedingExcluded = val && val.exclude
    return bleedingDeleted || bleedingExcluded
  }

  function maybeClearOldCycleStarts() {
    // if we have a new bleeding day, we need to clear the
    // menses start marker from all following days of this
    // menses that may have been marked as start before
    mensesDaysAfter.forEach((day) => (day.isCycleStart = false))
  }
}